\documentclass{standalone}
\usepackage{tikz}
\usepackage{ctex,siunitx}
\setCJKmainfont{Noto Serif CJK SC}
\usepackage{tkz-euclide}
\usepackage{amsmath}
\usetikzlibrary{patterns, calc}
\usetikzlibrary {decorations.pathmorphing, decorations.pathreplacing, decorations.shapes,}
\begin{document}
\small
\begin{tikzpicture}[>=latex,scale=1.0]
  % \useasboundingbox(-1,-2)rectangle(8,6);
  \fill[brown!50](0,0)circle(1)node[text=black]{微粒};
  \node at (2,1.5){液体分子};
  \foreach \x/\y in { -2.21/ 1.55, -2.66/ 0.75, -2.24/ 0.24, -2.53/-0.52, -2.11/-1.13, -2.40/-1.71, -1.31/-1.51, -1.40/-0.81, -1.95/-0.21, -1.66/ 0.47, -1.63/ 1.01, -0.93/ 1.14, -0.54/ 1.58,  0.65/ 1.46,  1.03/ 0.98,  1.51/ 0.62,  1.39/-0.40, -0.48/-1.49,  0.97/-1.55,  1.32/-1.07,  1.83/-1.58,  2.54/-1.55,  2.16/-1.00,  2.35/-0.53,  2.67/ 0.34,-1.52/ 1.61,-1.18/ 0.31,-1.44/-0.27,-0.99/-0.99,-0.88/-1.69, 0.31/-1.70, 0.70/-1.15, 1.78/-0.68, 2.36/ 0.34, 1.22/ 0.50, 1.62/ 1.11, 2.69/ 0.99,-1.12/ 1.72}
  {
    \draw[thin,->](\x,\y)--++(360*rand:0.5);
    \fill[inner color=white,outer color=red!20](\x,\y)circle(3pt);
  }
  % \fill[cyan!15,draw=black,very thin](-2.5,-0.5)rectangle(2.5,0);
  % \fill[cyan!5,draw=black,very thin](-2.0,0)rectangle(2.0,0.1);
  % \fill[cyan!5!white,draw=black,very thin](-1.5,0)rectangle(1.5,-0.3);
  % \draw[very thin](-0.5,0)to[bend left](-0.5,-0.3);
  % \draw[very thin](0.5,0)to[bend right](0.5,-0.3);
  % \foreach \x in{1,2,...,50}
  %   {
  %     \fill(rand*0.45,-0.15+rand*0.08)circle(0.01);
      
  %   }
  % \fill[left color=gray,right color=gray,middle color=white](-0.6,0.7)rectangle(0.6,2.0);
  % \fill[left color=gray,right color=gray,middle color=white](-0.6,0.7)--++(0.1,-0.2)--++(1.0,0)--++(0.1,0.2)--cycle;
  % \draw[thin](0.2,1.7)--++(45:1.0)node[above]{显微镜物镜};
  % \draw[thin](1.7,0.1)--++(45:1.0)node[above]{盖玻璃};
  % \draw[thin](0,-0.2)--++(-45:0.7)node[below]{悬浊液};
  % \draw[thin](-1.8,-0.2)--++(-135:0.7)node[below]{载物玻璃};
  % \draw[thick](6.5,1.0)circle(2.0);
  % \foreach \x in{1,2,...,400}
  % {
  %   \fill ([shift=(rand*360:rand*2.0)]6.5,1.0) ellipse (0.05*rand and 0.03);
  % }
\end{tikzpicture}
\end{document}